The error: [810295] Object used as template was not loaded from database.

We use v7.1.3 data import tool to load HR data from a CSV file. Today the log shows lots of same errors "2019-09-10 23:24:08 -04:00 - Serious -     Error in line 2154: [810295] Object used as template was not loaded from database.". We searched online but could not find any related to the error (either error code or the message). Has anyone seen this before or what could be the cause? Thank you in advance!